Dr. Johnson praised Shakespeare in his "Preface to Shakespeare" for his fidelity to human nature and realistic portrayal of characters. Though he found faults in some of Shakespeare's plots and comic scenes, Johnson believed Shakespeare excelled at depicting the truths of human psychology and capturing the diversity of human passions and motives. While Shakespeare violated the classical unities of time and place, Johnson argued this was not really a fault, and that the unities were not essential to a good play. Overall, Johnson provided a largely balanced critique and is credited with recognizing Shakespeare's profound understanding of human nature.